基于冲击滤波器的EBPSK软解调研究.pdf

Hans Journal of Wireless Communications 无线通信, 2015, 5(6), 111-118 Published Online December 2015 in Hans. /journal/hjwc /10.12677/hjwc.2015.56016 Research on EBPSK Soft Demodulation Based on Impact Filter Qi Hu, Lenan Wu Radio Engineering Department, Southeast University, Nanjing Jiangsu th th th Received: Nov. 6 , 2015; accepted: Nov. 27 , 2015; published: Dec. 8 , 2015 Copyright © 2015 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract This paper researches the possibility and performance of EBPSK soft demodulation based on im- pact filter. We use impact filter to demodulate EBPSK signals generally. Because of the impact fil- ter’s nonlinear character, it is hard to implement EBPSK soft demodulation. Referring to BPSK soft demodulation in Gaussian channel, this paper puts forward the theoretical soft information for- mula which is the critical point of soft demodulation, and verifies the rationality of the formula. Chase-3 algorithm is used to simulate this soft demodulation scheme and the simulation results show that soft demodulation scheme increases 0.5 dB compared with hard demodulation. Keywords EBPSK, Impact Filter, Soft Demodulation, Chase Algorithm 基于冲击滤波器的EBPSK软解调研究 胡 琪，吴乐南 东南大学信息科学与工程学院，江苏 南京 收稿日期：2015年11月6 日；录用日期：2015年11月27 日；发布日期：2015年12月8 日 摘 要 研究了EBPSK信号在冲击滤波器下的软解调的可行性与性能。在EBPSK解调端，一般使用冲击滤波器。由于 文章引用: 胡琪, 吴乐南. 基于冲击滤波器的EBPSK 软解调研究[J]. 无线通信, 2015, 5(6): 111-118. /10.12677/hjwc.2015.56016 胡琪，吴乐南 其非线性以及IIR的特性，所以EBPSK的软解调一直是个难题。本文参照BPSK解调的软解调，在高斯信道下， 从理论上给出了其软信息的形式，并将接收端的冲击幅度减去门限的绝对值作为接受信号的可靠性度量，验 证了其可